Improvement in molding wheels



2 Sheets-Sheet 1,- n.' B. SWIFT. 4 Mor-.DING WH-EELS, ege.

Patented May 2,1876.

NPEFERS, PHOTO-LITHDGRAPMER, WASHINGTON. D C

' this specification.

Prt'ruray'r- CFFIoii."

` nUFUs SWIFT, oF CLEVELAND, omo, AssIenon oF ONE-HALF His JOSEPH J. BROOKS, OF `SAME PLAGE.

IMPROVEMENT iN MoLDlNG WHEELS, at.Y

` Speciiication forming part of Letters VPatent No. 176,899, dated May 2, 1876 application filed i y February 5, 1876.

To vall whom it may Iconcern :V

Be it known that I, Rimes B. SWIFT, ofV

Cleveland, in the county ot' Cuyahoga and State of Ohio, have invented certain new and others skilled in the art to which it pertains tomake and use it, reference being had to the accompanying drawings, which form part of My invention relates to an'improvement in the manufacture of wheels, followers, piston- 'heads, and articles' generally having ai circular contour. y y The drawings represent my invention Ias adapted to the manufacture of spur,jbevel, orl

other descriptionof gear-wheels.

ing of the'eopetotbrni the upper face or surface of` a wheel, the f same constituting the irst step of my process, to be hereinafter described. Fig.- 2is a view in longitudinal section, showingth'e second step of my said process, where thejcope lhas been placed in position and the sand rammed over the bed, as shown in Fig. 1,*the do'tted"line showing the points of `separation Vwhen thecope shall bel removed. Fig. 3 is a view in longitudinal sec'- tion, showing the third step ofl my said process, wherein the cope has'becnremoved, the well dug, and'its bottomshaped to form the opposite surface or face of the wheel. Fig. 4

is a view. in longitudinal section, showing thev fourth step of my said process, wherein my showingthemovable tooth. Fig. 'Z is a plan view ofsaid segment, of its arm, and of my device 'forlengthening or shortening said arm, t0 diminish or increase the diameter ofthe Figure l represents avi iwf in longitudinal section,'sjhowing myvdevice asoperating inV vforming-a surface' forthe shaping or pattern'- 'wheeL Fig. 8.is a plan view of the well shown in Fig. 3, illustrating the manner of marking off and testing the arrangement of teeth on the rim ofthe wheeLj Fig. 9 isa segmentaly pieeeto protect the groove forthel formationA ot' the web or shroud of a gear-wheel during the operation of molding the teeth. Fig. 10 is an isometric View, showing my 'device as in the operation of forming' and molding the e able material, which is bedded in the iioor of the molding-roomto a suitable depth, to be entirely out of the Way in the operation of `moldingand casting. Bis a-post or spindle set into and supported by theV base A. B is a longitudriualslot made near the lower end of the spindle `B. O is aeircular sweep, having a removable blade, 01,'of definite form or contour, to fashion or mold the sand for shaping the upper face of the Wheel. O2 is a substitute blade to be placed upon the sweep C, for molding the sand to shape` the lower face of the wheel. D is an arm swinging upon the spindle B, for carrying the segment vD'.

the segment D. E is a journal or'boxiiig fixed upon the segment-arm D, whereby'said arm is lengthened or shortened at pleasure,A

serves to clamp thesegmentarm Din any de- `siredposition upon the post B. G represents 'the moldingsand as formed by the blade O1.- G shows the molding-sand as formed by the blade O2. g represents the prepared surface or face of the molding-floor left loutside of and around the well, 'for the purpose of providing an accurate bearing and support for the cope H. d representsl the test-marks made upon the molding-sand for determining vand proving the accurate position of the cogs or 'teeth upon the rim of the Wheel. I is a segmental d is a movable tooth placed at or near one end of v piece to rest in and protect the groove of the mold that forms the web or shroud of a gearwheel during the operation of molding the teeth.

Operation: The base A is first bedded in the molding-Hoor to a sniiicient depth to rest entirely below the bottom of the well, so as to be undisturbed and out of the way during the process of casting. `This base A, being once properly located, may remain permanent, and employed for any desired number of subsequent castings at that place. Its removal, however, when desired, is a simple operation, requiring only to be dug up and fransplanted. .This base gives support to the post or spindle B, upon which operate various port-ions of my device, as will hereinafter appear.

The base A and postB having been located, as above shown, the subsequent steps and operations are as follows: The sweep C, armed with the blade G1, is lirst placed in position on the post B. lhe molding-floor beneath is now properly prepared and shaped by sweeping the blade Cl around until the desired contour is obtained. This contour may be of anyA desired fashion or pattern, according to the shape ofthe blade G1. Fig. 1 of the drawings shows this step of the operation as accomplished with the mechanism just described. When the molding-sand has been properly shaped by the blade Clit is covered with parting-sand, and the sweep C and blade' U1 removed. The cope H is now made by ram- .ioned by the blade C2, whose operation is similar to that of the blade C1. Fig. 3 of the drawings shows this step of my process.

The next operation is the molding of the cogs or teeth upon the rim of the wheel; andfor the purpose of illustrating my invention I have here described the operation of making.

what is technically called a webbed or shrouded gear-wheel, although itis mani.- fest that my invention is not at all limited to the construction of any particular article.

The method of molding` the cogs or teeth constitutes an important feature of my invention. rlo perform this step of my operation the segment-arm D is placed upon the post B, as shown in Figs. 4 and l0 of the drawings, and the movable tooth d adjusted in such a manner that its bottom will touch the iioor of the well at the same time as its fellow teeth. The segment Dl is preferably made to be some denite fraction of a circle, though this rule is not essential. 1

By means of the adjusting `device El the segment-arm maybe lengthened or shortened at pleasure, and by .means of the device E it may be clamped or fixedat any desired length lor at any desired point upon its spindle B, as

the segment to the bottom of the well and tracing d is made in the molding-sand around the tooth d, also around the second tooth from` that end of the segment D opposite to the movable tooth d. rlhe tracing around this said second tooth is only made at the first tracing. The segment'D is now moved forward one length, and the movable tooth d iliade to register over the tracing-mark of the aforementioned second tooth. In this psition the tracing is taken around the movable toothpthe segment again moved one length forward, and so on until the circle is completed. lf atthe last placing of the segment the tooth d should register accurately over the first tracing, itis apparent that the teeth will be regular upon the rim of the wheel. It',

however, the lastv placing of the segment D shows an imperfect registration of the tooth d with the first tracing, thenthe segment-arm D m'ustbe lengthened or shortened, as may be necessary, until the registration above named is perfect-,in other words, untilthe cogs or the teeth will all come evenly and regularly upon the rim of the wheel. When this adjustment has been accurately determined the clamping device E is put in operation and the rim fixed at its proper length upon its post B. This being accomplished,the process of molding the teeth next follows, and this is done by sliding down the movable tooth d so that its bottom end projects lower than those of its stationary teeth. The segmental piece shown in Fig. 9 of the drawings is then placed so as to protect that portion of the mold which forms the web or shroud, and the l segmental arm is let down upon the oor of the well. board or piece of sheet metal, or anything of the like, is placed against one end of the segment D', to prevent the escape or spreading of the sand during the process of rammin g it.

When the sand has been properly molded against the segment, the segment is drawn by first loosening the screw of the device El, which will retract the segment slightly, and

enable it to be slid upward by its arm D upon l the post B. The segment and its arm are ythen moved forward one' length and placed in proper position upon the licor of the well, next ladjacent to that portion Where the teeth have been already molded, .the board to support the sand is againl placed in position, and another section of cogs or teeth molded, as above described. This operation is repeated until [the entire circle is completed. The post B is now removed by simply drawingout from the post A, having iii-st loosened it-by tapping upon the wedge passing throughthe slot B near the bottom of the post B. The proper cores are now adjusted which are to form the rims and the shaft or center4 hole.

A stop or barrier, which may be a v The cope H 1s now placed over the well, being directed f by suitable guides to insure its' exact` and proper positions and, asbefore mentioned, the l ranged below the lower plane of the circular i finished surface g gives `a perfect and equal bearing between the cope'and Well. The cope having been duly securedin position, all things are. nowl readyfor a casting, whichgmay be done in any suitable manner. y

I desire it to be clearly understood lthat the description herein VVgiven isgbut one of many applications to which my invention is capable of being put. It is adapted to the manufacture of 'Wheels of .every description also, to the making oflyalmost any article having acir` cular contour; and in` fitting it to these vari ous usesmy invention is susceptible ot' many modifications without any departure from its spirit and intent.v

y1. The-rco'mbinatiomwit-h a spindle-bearing,

l A, andspindleB, of a circular sweep for carl rying blades-orformers, the said spindle-bearing adapted to be embedded in the sand be Y low thecircular sweep, substantially as and Vfor the purpose described. v

2. The combination, with the spindle-bearsweep, substantially as and for the purpose described.

3. The removable post or spindle B, in conlbination with the slot and wedge B', and base A, substantially as and for the purpose shown.

4. In combination with the central post or spindle B, the segment-arm D andv segment D of a cog-wheel pattern, provided with the movable tooth d, substantially as and for the purpose shown. v y

.5. The process, substantially as herein described, in the molding of wheels and articles of a similar character, of molding or formingv the cope by rst shaping the sand upon the" molding-door by a bladed circular sweep, and

molding said cope over the door thus shaped, substantially as shown.

ln testimony whereof Ihave signed my naine Y presence of two to this specification inthe subscribing witnesses. Y

RUFUS B3. SWIFT., Witnesses: i i

LEVERETT L. LEGGETT,

J osEPH J. BROOKS. 

